If I have relation schema R(A, B, C, D, E) with functional dependencies: AB->C, CD->E, C->A, E->D:
a)find all the (minimal) keys for R
b)state the normal form for R and describe functional dependencies that violate higher NF
c)decompose R into 2 (or more) relations that are in highest possible normal form (if possible) and give for each relation of your decomposition a minimal basis for the FD that hold in these relations